Well I talked to the guy that sales the shackels on ebay and he told me to make the hole to hole spacing for the shackels 9" the stock shackels are 5" I think a 4" increase is a lot so I am going to make a set at 9" and a set at 7.5" and see what looks better. The question that I have now is if I lift the front up 2.5" will the stock shocks work until I can get a new set.